Delphi 10.4 fullscreen Iframe video in TAdvWebBrowser

Question

I have a video in Iframe format in the TAdvWebBrowser. When I click on a fullscreen button nothing happens.

var HTML:='<iframe src="'+URL+'"frameborder="0" allow="autoplay; fullscreen; picture-in-picture" style="position:absolute;top:0;left:0;width:100%;height:100%;"</iframe>';

WebBrowser.LoadHTML(HTML);

I need the video show fullscreen. Is this possible?

Answer 1

In order to show video in FullScreen you need to do the following

1. Switch your application into a full screen window. What is the best way to make a Delphi Application completely full screen?
2. Resize your browser component so that it fills the entire window.

EDIT: Looking at TAdvWebBrowser developer guide it doesn't sem that TAdvWebBrowser supports detecting when a HTML element of a web page is entering or leaving FullScreen mode.